Calculate hole volume from radius or diameter and depth, diameter from hole area, a cutting-tap drill size estimate or finished-hole tolerance limits.

Straight round hole; drill-tip cones and chamfers are not included.

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Hole Size Formula

The following formula and example apply to the cylindrical-volume mode. For diameter from area, d = 2√(A/π). Finished-hole limits equal nominal plus the lower and upper signed deviations.

HS = π×hr2×hd

Variables:

  • HS is ideal cylindrical hole volume (ft³), not diameter or tap-drill size
  • hr is the hole radius (ft) 
  • hd is the hole depth (ft) 

How to Calculate Hole Size?

The following steps outline how to calculate the Hole Size.

  1. First, determine the hole radius (ft). 
  2. Next, determine the hole depth (ft). 
  3. Next, gather the formula from above = HS = pi*hr2*hd.
  4. Finally, calculate the Hole Size.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

hole radius (ft) = 3

hole depth (ft) = 10

HS = π × 3² × 10 ≈ 282.743339 ft³. The model excludes drill-tip cones, chamfers and irregular walls.